W55Header code — not billable
Contact with other mammals
- Chapter
- 20. External causes of morbidity
- Category
- W55
- Effective date
- October 1, 2026
Related codes in category W55
W55.0Contact with catW55.01Bitten by catW55.01XABitten by cat, initial encounterYesW55.01XDBitten by cat, subsequent encounterYesW55.01XSBitten by cat, sequelaYesW55.03Scratched by catW55.03XAScratched by cat, initial encounterYesW55.03XDScratched by cat, subsequent encounterYesW55.03XSScratched by cat, sequelaYesW55.09Other contact with catW55.09XAOther contact with cat, initial encounterYesW55.09XDOther contact with cat, subsequent encounterYes
Frequently asked questions
What is ICD-10 code W55?
W55 is an ICD-10-CM diagnosis code for Contact with other mammals.
Is W55 a billable code?
No. W55 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is W55 in?
W55 falls under Chapter 20: External causes of morbidity.
When did W55 become effective?
W55 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to W55?
W55 belongs to category W55, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.